zaključna naloga Univerzitetnega študijskega programa I. stopnje Strojništvo - Razvojno raziskovalni program
Ivan Žan Barbarić (Author), Lidija Slemenik Perše (Mentor)

Abstract

Polimeri so v današnjem času nepogrešljivi inženirski materiali. V sklopu zaključne naloge smo z uporabo strokovne literature analizirali strukturo in lastnosti polimerov, ki vplivajo na njihovo uporabo v konstrukcijah. Cilj naloge je bil ugotoviti, kako hitrost spreminjanja temperature in izpostavljenost vremenskim vplivom vplivata na izbrane polimerne materiale. Eksperimente smo izvedli na polimerih: polikarbonat (PC), polimetil metakrilat (PMMA) in polioksimetilen (POM). S tehnikama diferenčne dinamične kalorimetrije in dinamične mehanske analize smo proučevali, kako se vrednost temperature steklastega prehoda (Tg) spreminja s spreminjanjem hitrosti segrevanja in ob izpostavljenosti vremenskim vplivom. Z višanjem hitrosti spreminjanja temperature je pri PC in PMMA naraščala temperatura začetka območja Tg, medtem ko, hitrost segrevanja ni imela vpliva na POM. Izpostavljenost vremenskim vplivom je povzročila veliko količino absorbirane vlage pri PMMA, medtem ko, so bile spremembe pri PC in POM zanemarljive.

Keywords

polimeri v konstrukcijah;diferencialna dinamična kalorimetrija;dinamična mehanska analiza;termične lastnosti;vplivi iz okolja;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [I. Ž. Barbarić]
UDC: 539.3:620.173.2:159.922.25(043.2)
COBISS: 202565123 Link will open in a new window
Views: 82
Downloads: 25
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Other data

Secondary language: English
Secondary title: Polymers in structures
Secondary abstract: Polymers are indispensable engineering materials in today's time. In the scope of this thesis, we used technical literature to analyze the structure and properties of polymers that affect their use in structures. This thesis aims to determine how the rate of temperature change and exposure to weather conditions affect selected polymeric materials. Experiments were conducted on the polymers polycarbonate (PC), polymethyl methacrylate (PMMA), and polyoxymethylene (POM). Using the techniques of differential scanning calorimetry and dynamic mechanical analysis, we studied how the value of the glass transition temperature (Tg) changes when changing the heating rates or exposing the material to weather conditions. With increasing heating rates, the temperature at the beginning of the Tg range increased for PC and PMMA, while the change of heating rate had no effect on POM. Exposure to weather conditions caused a significant amount of moisture absorption in PMMA, while changes in PC and POM were negligible.
Secondary keywords: polymers in structures;differential scanning calorimetry;dynamic mechanical analysis;thermal properties;environmental influences;
Type (COBISS): Final paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za strojništvo
Pages: XII, 54 f.
ID: 24426507
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